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# basic circuits

### third form electric circuits

What does p.d. stand for? Potential Difference
Units of P.D.? volts
Difference between cell and battery? A battery is a group of cells.
Letter for P.D. in equations? V
What units is current measured in? amperes or amps (A)
Letter for current in equations? I (capital eye!)
Which kind of circuit has only one path for the electric current? a series circuit
Which kind of circuit has more than one track that the current can follow? a parallel circuit
What are the units of resistance? ohms
What Greek letter is used as a symbol for ohms? omega
If the current is 2 A when the p.d. is 6 V, what is the resistance? 6/2 = 3 ohms
A 2 ohm resistor and a 3 ohm resistor are connected in series. What is their total resistance? 5 ohms.
A 2 ohm resistor and a 3 ohm resistor are connected in series. 4 amps flows through the 3 ohm resistor. What current flows through the other one? The same, they are in series, 4 amps.
Three lamps are connected in series to the power supply. One burns out. What happens to the others? They go out, the circuit is broken.
Three lamps are connected in parallel to the power supply. One burns out. What happens to the others? They stay on, they each have their own circuit.
Name of component that only allows current to flow one way? diode
Name of component that only allows current to flow one way and gives out light when current flows? LED - light emitting diode
Name of component whose resistance gets smaller when it is hot? thermistor
Name of component whose resistance is bigger when it is dark? LDR, light dependent resistor
unit of charge? coulombs
formula to calculate charge? current in amps times time in seconds
A 2 ohm resistor and a 3 ohm resistor are connected in parallel. The PD across the 2 ohm resistor is 8 V. What is the p.d. across the 3 ohm resistor? The same, they are in parallel, 8 volts.
Created by: waslancing